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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1ead2f21bff0662fd65d889889cf51839a7b66a83c7ccbd4dc1428df1b0fd1a' 
  AND token = '6y0A9jKAEMEt/LniK5wG3SNVj4wtiwe/ySxS3j/056s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}